koolkids

Has anyone had any success hooking up the FlexiForce 100lb Pressure Sensor to the Arduino? This is what we have done:

We hooked up the the left pin to the 5V, the middle pin to ground, and the right pin to A0. This is the only setup that gives us a reading. Our problem is that when we slightly press on the pressure sensor, the serial monitor shows the maximum, 1023!

The schematic is here. http://www.tekscan.com/flexible-force-sensors#specifications

Are we required to use an opamp or is there some kind of code that can replace the opamp?

Yes, you need a op-amp circuit to output a usable DC signal for a Arduino analog input pin. Below is their recommended 'conditioning/calibrating' circuit.

It's a pain to have to come up with that negative 1 volt for the sensor and calibrating the feedback resistor looks to be a pain. It's an interesting sensor, but they sure didn't make it very user friendly for interfacing.